tosr: Create the Tree of Science from WoS and Scopus

The R package ‘tosr’ enables the construction of the Tree of Science (ToS), a metaphorical representation of scientific papers on a specific topic. The ToS’s roots symbolize seminal works, the trunk stands for structural works, and the leaves depict the current literature. Traditionally, researchers have had to limit their ToS to data from a single database, such as Scopus or Web of Science (WoS). The ‘tosr’ package overcomes this limitation by allowing researchers to merge seed files from both Scopus and WoS, thereby facilitating a more comprehensive bibliometric analysis. This paper describes the development and application of the ‘tosr’ package, demonstrating its unique capabilities in creating a completer and more cohesive ToS and citation network for any scientific topic. By bridging the gap between these two major databases, ‘tosr’ offers researchers an unprecedented tool for scientometric research.